微电网多层协同自适应保护原理与方案研究

Microgrid is an important carrier to integrate distributed new energy resources. It is capable of fully consuming renewable energy resources and realizing the comprehensive and efficient utilization of green energy resources. Microgrid has flexible operation and complex fault characteristics. Its safe and stable operation relies on the coordinated work of the protection system. This project aims to solve the key technical problems of relay protection during the popularization, application and future development of new energy microgrids, to achieve breakthroughs in the protection principles and technical schemes for microgrids, and to improve the operation stability and reliability of the system. Analyze the short circuit fault characteristics and the transient stability of microgrids, divide microgrid protection into unit level, extension level, feeder level and system level from the perspective of diffusion attenuation of fault impact scope, analyze the coordination mechanism, and build a multi-level protection structure system; propose current differential protection principles considering inverse time, research the configuration and coordination of multi-level protection, research adaptive protection setting methods considering critical clearing time, and propose multi-level coordinated adaptive protection schemes for microgrids; verify and improve the principles, schemes and algorithms on digital simulation platforms. This project will realize the multi-level, coordinated and orderly isolation of microgrid faults and provide theory and technical support for the technical application and project construction of new energy microgrids. This project is of great theoretical significance and practical value.

微电网作为分布式新能源集成的重要载体，能够充分消纳可再生能源，实现绿色能源综合与高效利用。微电网运行方式灵活，故障特性复杂，其安全稳定运行依赖于保护的协同工作。本项目以解决新能源微电网推广应用及未来发展过程中存在的继电保护关键技术问题为目标，实现微电网保护原理与技术方案的突破，提高系统运行稳定性与可靠性。分析微电网短路故障特性及其暂态稳定性，从故障影响范围的角度将微电网保护分为单元层、扩展层、馈线层与系统层，分析协同工作机理，构建多层保护结构体系；提出考虑反时限的电流差动保护原理，研究多层保护配置方案与协同配合方法，结合临界切除时间，研究自适应保护整定策略，提出微电网多层协同自适应保护方案；通过数字仿真与测试平台对保护原理、方案与算法进行测试和验证。本项目的研究将实现微电网保护分层、协同、有序切除故障，为推进新能源微电网技术应用与项目建设提供理论与技术支撑，具有重要的理论意义与实用价值。

微电网作为分布式新能源集成的重要载体，能够充分消纳可再生能源，实现绿色能源综合与高效利用。微电网运行方式灵活，故障特性复杂，其安全稳定运行依赖于保护的协同工作。本项目以解决新能源微电网推广应用及未来发展过程中存在的继电保护关键技术问题为目标，实现微电网保护原理与技术方案的突破，提高系统运行稳定性与可靠性。分析微电网短路故障特性及其暂态稳定性，从故障影响范围的角度将微电网保护分为单元层、扩展层、馈线层与系统层，分析协同工作机理，构建多层保护结构体系；提出考虑反时限的电流差动保护原理，研究多层保护配置方案与协同配合方法，结合临界切除时间，研究自适应保护整定策略，提出微电网多层协同自适应保护方案；通过数字仿真与测试平台对保护原理、方案与算法进行测试和验证。本项目的研究将实现微电网保护分层、协同、有序切除故障，为推进新能源微电网技术应用与项目建设提供理论与技术支撑，具有重要的理论意义与实用价值。